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Capitalized Interest (Tables)
 6 Months Ended
Jun. 30, 2018
Capitalized Interest Costs, Including Allowance for Funds Used During Construction [Abstract]  
Summary of Interest Costs Incurred, Capitalized, Expensed and Charged to Cost of Sales
The following table reflects the changes in the Company's capitalized interest during the three and six months ended June 30, 2018 and 2017:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Interest capitalized, beginning of period
 
$
5,545

 
$
5,564

 
$
5,583

 
$
5,106

Interest incurred
 
6,624

 
6,580

 
13,220

 
13,139

Interest charged to interest expense
 
(6,329
)
 
(5,914
)
 
(12,611
)
 
(11,750
)
Interest charged to cost of sales
 
(452
)
 
(278
)
 
(804
)
 
(543
)
Interest capitalized, end of period
 
$
5,388

 
$
5,952

 
$
5,388

 
$
5,952